The 26-year-old has twice reached double figures in second-serve misses - in the first and third rounds last week - but ahead of her clash with Williams, insisted she would not be taking anything off the shot. The Italian took the first set six games to three.
23-time Grand Slam champion Serena Williams rallied from a set down to dismiss Camila Giorgi and reach her first grand slam semi-final since becoming a wife and a mother. Things will be expected to be more straightforward for Williams, even though Goerges will enter the match in a winning mood.
Ostapenko, 21, had admitted she cracked under the strain of defending the French Open title when she lost in the first round last month.
In June, she was a match away from the French Open quarterfinals before withdrawing from the tournament an hour before her anticipated match against Maria Sharapova. It's an honour to play Serena. In fact, photographers have captured Drake, 31, courtside at Williams' matches since 2011. Be a good friend and let her win'.
For the first time in the tournament the 36-year-old was seriously challenged as unseeded Giorgi fought fire with fire to claim the first set on Centre Court. Rodina called Williams her idol and one look at Williams' performance it was clear to see why.
Williams is looking for her eighth Wimbledon title and has established herself as the big favorite once again. Williams has more wins in a major after losing a first set (39) than any other player in the women's Open era (Chris Evert has 28 and Venus Williams has 27).
The fifth-seeded del Potro failed to convert four match points when serving at 5-4 in the fourth set, but maintained his composure to close out the contest with his first opportunity in the tiebreaker that followed. "I think it's a great week". I don't feel pressure; I don't feel like I have to win this. "I'm enjoying every moment".
"But I'm just very glad the way I handled everything today because it wasn't an easy match at all".
Steady and solid was winning the day and Kerber, who at number 11 is the highest seed left in the women's event, consolidated the break thanks to a wide ace.
Her opponent on Friday, Julia Goerges, is seeded 13th. Williams holds a 3-0 head-to-head record over Goerges, with the most recent victory coming in the third round of the French Open last month.
There was still the odd sign of rustiness - she sent a simple forehand smash into the net in the seventh game of the first set and at times was unable to deal with Rodina's soft serves - but she marched through the match in only 62 minutes and has yet to drop a set at this year's Wimbledon.
Here's the reason Williams has emerged as a favorite: She has seven Wimbledon titles, while the rest of the field has zero.
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